Ments



(No Model.)

H. ROBISGHUNG. MEANS FON HOLDING PRINTING PLATES 0N GYLINDNIGAL-ON PLATSURFAGBS.

Patented Ma amas/exs UNITED VSTATES ATENT OFFICE.

HENRY RoEIscI-IUNG, or cIIIoAedfILLINoIs, ASsIcNoE, EY MESNE ASSIGN-MENTS, To THE CAMPBELL PRINTING PRESS AND MANUFACTURING coM- PANY, OFNEV YORK, N. Y.

MEANS FOR HOLDING PRINTING-PLATES ON CYLINDRICAL OR FLAT SURFACES.

SPECIFICATION forming part of Letters Patent No. 427,366, dated May 6,1890.

Application filed September 23, 1889. Serial No. 324,788. (No model.)

To @ZZ whom t may concern:

Be it known that I, HENRY ROBISCHUNG, of Chicago, in the county of Oookand State of Illinois, have invented new and useful Improvements inMeans for Holding Printing- Plates on Cylindrical or Flat Surfaces,which invention is fully set forth and illustrated in the followingspecification and accompanying drawings.

1o The object of this invention is to provide in printing-machines meansfor securing short plates upon plate-holders, beds, or turtles when adesign smaller than the whole surface of the holder, bed, or turtle isto be printed,

so that only the surface of the short plate to be printed from will bepresented at the printing height, the remainder of the surface beingkept from cont-act with the impressioncylinder and inking-rollers intypographie zo printing, as well as from those and the waterrollers inprinting from zinc or other plates by the lithographie method.

The invention will rst be described in detail, and then particularly setforth in the 2 5 claims.

In' the accompanying drawings, Figure 1 illustrates a longitudinalvertical section of a flat-surfaced bed or plate-holder; Fig. 2, a planof the same partially broken away 3o to show the construction of thestraining-levers and their dependencies, and Fig. 3 a longitudinalvertical section of a cylindrically-surfaced bed or turtle. Fig. 4illustrates a portion of Fig. 1 in enlarged section, and

3 5 Fig. 5 a modification of detail hereinafter particularly described.

In said figures, the number 8 indicates the bed or turtle; 2, the shortplate to be printed from, turned into an open hem at the ends, as

4o shown at 3 and 13. The plate or bar 4 issecured to one end of the bedor turtle, forming, with a part of the surface of such bed or turtle, athin groovefor the reception of the turned hem at one end of theprinting-plate 2, the other end of which plate is'similarly turned intoan open hem, as at 13. The printing-plate 2 is underlaid by a plate 14of the desired length and the proper thickness to keep the surface ofthe printing-plate higher 5o than the auxiliary holding-plate 15,hereinafter described, the surface of the bed or turtle 8 being made tothe proper height to permit of this. The straining-levers 5, providedWith straining-screws 7, are fulcrumed at 9, and

carry a plate or plates 6 on their upper ends, 5 5

formed for the reception of the turned hem of a plate, as shown at 17,similar to that shown at 3. The auxiliary plate 15, preferably of thinsteel, is also turned into open hems at its two ends, as at 16 and 17.The hem 13 of the printing-plate 2 and the hem 16 of the auxiliary plate15 are hooked into each other, andV the hem 17 of said auxiliary plateis hooked into the straining-levers 5, as shown at 17.

The dotted lines 18 show the printing-line in each case extending overthe auxiliary plate 15, below which line it is designed to keep theauxiliary plate to prevent the contact of the same with theimpression-cylinder 7,0 and the inking or Water rollers, as abovementioned.

The modification shown in Fig. 5 exhibits a metal splicing-piece orvlink 18, made preferably of a thin strip of steel. Said splicingpiecemay be used, as shown, to connect, by means of its double hem-hook orchannel shape, a printing-plate 2 to the auxiliary or straining plate15, instead of connecting the plates 2 and 15 directly together, asshown in 8o the other figures. The plate 15, if the link 18 be used, maybe made of old or other inferior metal-such as zinc-unfit to be used fora printing-plate, and thus a saving effected by the interposition anduse of said link. The 8 5 smaller the printing-plate 2 is required to bethe greater the saving, whether the link 18 be used or a steel plate 15be used without said link.

It is evident that the shortlink of Steel is cheaper than a long strip15 of the same metal; hence, the link being of steel and the plate 15 ofold zinc, the cost of a steel plate 15 is practically eliminated byinterposing the steel link 13. The plate 15 cannot be 95 made of zincand used without the link 18, because the two zinc plates will not holdby their hems together. One Zinc and one stiffer metal must interlock.

By this invention auxiliary plates, such as Io:

l5, and underlaying-plates, such as 141nay be kept on hand conforming tothe various lengths of sheet or design required to be printed, and aprinting-plate, such as 2, of any desired length, from the least up toand including a full-length plate, may be readily placed and strained onthe bed or turtle in an expeditious manner.

The underlaying-plates 14, by being made only of the size of the surfacedevoted to making the impression, perform, among others, a veryimportant oTioe-mamely, that of preventing the Water from mixing withthe ink, and thus diluting it and making the impression pale orindistinct, which happens when small surfaces of large sheets of zincare Caused to do the printing Without the interposition of such platesas 14.

The straining-levers 5 and their adjustment form no part of thisinvention.

H. ROBISCHUNG.

1Witnesses: A. CRANDALL, A. J. ZWART.

